#include <49func.h>
int main(int argc, char *argv[])
{
    // ./4_server 192.168.118.128 1234
    ARGS_CHECK(argc,3);
    int sockfd = socket(AF_INET,SOCK_DGRAM,0);//udp SOCK_DGRAM
    struct sockaddr_in serverAddr;
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(atoi(argv[2]));
    serverAddr.sin_addr.s_addr = inet_addr(argv[1]);
    int ret = bind(sockfd,(struct sockaddr *)&serverAddr,sizeof(serverAddr));
    ERROR_CHECK(ret,-1,"bind");
    // 服务端先recvfrom
    struct sockaddr_in clientAddr;
    socklen_t clientAddrSize = sizeof(clientAddr);
    char buf[4096] = {0};
    recvfrom(sockfd,buf,sizeof(buf),0,
            (struct sockaddr *)&clientAddr,&clientAddrSize);
    printf("client ip = %s, port = %d\n",
           inet_ntoa(clientAddr.sin_addr),ntohs(clientAddr.sin_port));
    printf("buf = %s\n", buf);
    sendto(sockfd,"hello",5,0,
           (struct sockaddr *)&clientAddr,clientAddrSize);
    sendto(sockfd,"world",5,0,
           (struct sockaddr *)&clientAddr,clientAddrSize);
    close(sockfd);
    return 0;
}

